Mercurial > projects > dwt-linux
view dwt/custom/StyleRange.d @ 315:21959e16bc1e
Improved Listeners access functions.
author | Frank Benoit <benoit@tionex.de> |
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date | Tue, 16 Sep 2008 15:28:21 +0200 |
parents | c0d810de7093 |
children |
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/******************************************************************************* * Copyright (c) 2000, 2008 IBM Corporation and others. * All rights reserved. This program and the accompanying materials * are made available under the terms of the Eclipse Public License v1.0 * which accompanies this distribution, and is available at * http://www.eclipse.org/legal/epl-v10.html * * Contributors: * IBM Corporation - initial API and implementation * Port to the D programming language: * Frank Benoit <benoit@tionex.de> *******************************************************************************/ module dwt.custom.StyleRange; import dwt.dwthelper.utils; import dwt.DWT; import dwt.graphics.Color; import dwt.graphics.TextStyle; import dwt.internal.CloneableCompatibility; import dwt.custom.StyleRange; import dwt.custom.TextChangedEvent; import dwt.custom.TextChangingEvent; static import tango.text.Text; alias tango.text.Text.Text!(char) StringBuffer; /** * <code>StyleRange</code> defines a set of styles for a specified * range of text. * <p> * The hashCode() method in this class uses the values of the public * fields to compute the hash value. When storing instances of the * class in hashed collections, do not modify these fields after the * object has been inserted. * </p> * * @see <a href="http://www.eclipse.org/swt/">Sample code and further information</a> */ public class StyleRange : TextStyle, CloneableCompatibility { /** * the start offset of the range, zero-based from the document start */ public int start; /** * the length of the range */ public int length; /** * the font style of the range. It may be a combination of * DWT.NORMAL, DWT.ITALIC or DWT.BOLD * * Note: the font style is not used if the <code>font</code> attribute * is set */ public int fontStyle = DWT.NORMAL; /** * Create a new style range with no styles * * @since 3.2 */ public this() { } /++ + DWT extension for clone implementation +/ protected this( StyleRange other ){ super( other ); start = other.start; length = other.length; fontStyle = other.fontStyle; } /** * Create a new style range from an existing text style. * * @param style the text style to copy * * @since 3.4 */ public this(TextStyle style) { super(style); } /** * Create a new style range. * * @param start start offset of the style * @param length length of the style * @param foreground foreground color of the style, null if none * @param background background color of the style, null if none */ public this(int start, int length, Color foreground, Color background) { super(null, foreground, background); this.start = start; this.length = length; } /** * Create a new style range. * * @param start start offset of the style * @param length length of the style * @param foreground foreground color of the style, null if none * @param background background color of the style, null if none * @param fontStyle font style of the style, may be DWT.NORMAL, DWT.ITALIC or DWT.BOLD */ public this(int start, int length, Color foreground, Color background, int fontStyle) { this(start, length, foreground, background); this.fontStyle = fontStyle; } /** * Compares the argument to the receiver, and returns true * if they represent the <em>same</em> object using a class * specific comparison. * * @param object the object to compare with this object * @return <code>true</code> if the object is the same as this object and <code>false</code> otherwise * * @see #hashCode() */ public override int opEquals(Object object) { if (object is this) return true; if (auto style = cast(StyleRange) object ) { if (start !is style.start) return false; if (length !is style.length) return false; return similarTo(style); } return false; } /** * Returns an integer hash code for the receiver. Any two * objects that return <code>true</code> when passed to * <code>equals</code> must return the same value for this * method. * * @return the receiver's hash * * @see #equals(Object) */ public override hash_t toHash() { return super.toHash() ^ fontStyle; } bool isVariableHeight() { return font !is null || metrics !is null || rise !is 0; } /** * Returns whether or not the receiver is unstyled (i.e., does not have any * style attributes specified). * * @return true if the receiver is unstyled, false otherwise. */ public bool isUnstyled() { if (font !is null) return false; if (rise !is 0) return false; if (metrics !is null) return false; if (foreground !is null) return false; if (background !is null) return false; if (fontStyle !is DWT.NORMAL) return false; if (underline) return false; if (strikeout) return false; if (borderStyle !is DWT.NONE) return false; return true; } /** * Compares the specified object to this StyleRange and answer if the two * are similar. The object must be an instance of StyleRange and have the * same field values for except for start and length. * * @param style the object to compare with this object * @return true if the objects are similar, false otherwise */ public bool similarTo(StyleRange style) { if (!super.opEquals(style)) return false; if (fontStyle !is style.fontStyle) return false; return true; } /** * Returns a new StyleRange with the same values as this StyleRange. * * @return a shallow copy of this StyleRange */ public /+override+/ Object clone() { return new StyleRange( this ); } /** * Returns a string containing a concise, human-readable * description of the receiver. * * @return a string representation of the StyleRange */ public override String toString() { StringBuffer buffer = new StringBuffer(); buffer.append("StyleRange {"); buffer.append(start); buffer.append(", "); buffer.append(length); buffer.append(", fontStyle="); switch (fontStyle) { case DWT.BOLD: buffer.append("bold"); break; case DWT.ITALIC: buffer.append("italic"); break; case DWT.BOLD | DWT.ITALIC: buffer.append("bold-italic"); break; default: buffer.append("normal"); } String str = super.toString(); int index = tango.text.Util.locate( str, '{'); if( index is str.length ) index = -1; str = str[ index + 1 .. $ ]; if (str.length > 1) buffer.append(", "); buffer.append(str); return buffer.toString(); } }